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APPENDIX
| Mars | 3.1 | miles | a | second. | ||
| Jupiter | 37. | " | " | " | (mean | value). |
| Saturn | 22. | " | " | " | " | " |
| Uranus | 13. | " | " | " | " | " |
| Neptune | 14. | " | " | " | " | " |
| Sun | 382. | " | " | " |
While the probable maximum speed of the molecules of some of the common gases at 0° Cent. are as follows:—
| Hydrogen | 7.4 | miles | a | second. |
| Water vapor | 2.5 | " | " | " |
| Nitrogen | 2.0 | " | " | " |
| Oxygen | 1.8 | " | " | " |
| Carbonic dioxide | 1.6 | " | " | " |
Note II
The change in the apparent size of the equatorial diameter as compared with the polar one as the phase increased, suggesting the unconscious measurement of a twilight upon the planet, becomes still more striking when, in addition to the October-November measures mentioned in the text, the measures from July to October are considered in connection with them. Tabulated chronologically, the whole are as follows:—
| Cor. for ref. irr. tilt and phase Irr. 0".10 |
Prob. error |
Angle of phase |
Cor. for ref. irr. tilt and phase Irr. 0".15 | |
| July (6 to 22 inc.) | 9.976 | 0".13 | 0° | 9.933 |
| Aug. (11 to 21 inc.) | 9.362 | 0".04 | 0° | 9.325 |
| Sept. (20 to Oct. 5 inc.) | 9.401 | 0".012 | 0° | 9.355 |
| Oct. (12 & 24 to 30 inc.) | 9.375 | 0".028 | 1° | 9.336 |
| Oct. (15 to 23 inc.) | 9.379 | 0".011 | 2°.5 | 9.339 |
| Oct. (12 & 24 to 30 inc.) | 9.375 | 0".028 | 1° | 9.336 |
| Nov. (2 to 21 inc.) | 9.390 | 0".012 | 4° | 9.350 |
